ChatGPT Space and Projects vs Gemini Notebook (formerly NotebookLM)

Your research has three possible homes, and two of them are in ChatGPT. ChatGPT Space holds Pages, documents that ChatGPT drafts and edits with you and your team. ChatGPT Projects keep chats, files and instructions together. Gemini Notebook (formerly NotebookLM) keeps your sources and answers only from them, with a citation on each claim. They overlap less than the names suggest. Here’s what each one does, which plans include it, and how to split the work so you stop pasting the same facts between tabs.

Key Takeaways

• ChatGPT Space is “a home for your pages, uploaded files, and other work in ChatGPT.” It replaces Library, and Projects stay separate (OpenAI Help, 2026).
• Creating and editing pages takes ChatGPT Pro, Business or Enterprise. Projects work on every plan, Free included.
• Gemini Notebook answers only from your sources and cites them. A free account gets 100 notebooks with 50 sources each.
• Keep sources and fact-finding in a notebook, drafts and team docs in Pages, and let Kortex carry answers between them.

What is ChatGPT Space, and what are Pages?

ChatGPT Space is OpenAI’s document workspace inside ChatGPT, and Pages are the documents in it. OpenAI defines a page as “an editable document,” such as a project brief, meeting notes or a research summary (OpenAI Help, 2026). A space groups related pages and files. Everyone gets a personal space, and you can add more for a topic or a team, with folders and subpages inside. You can start a page from a conversation, write in Space directly, or pick a template. After that, you edit the text yourself or ask ChatGPT for a change to one section or the whole page. For example, you might ask it to “shorten the introduction and keep the recommendations unchanged.” Pages can also hold charts, trackers and interactive tools that ChatGPT builds, and comments let you flag a single passage for a fix.

Where you can use it matters. Creating and editing in Space takes ChatGPT Pro, Business or Enterprise, on the web or in the desktop app. The mobile app can find, read and share pages, but it can’t edit them. Space also replaces Library, and its Images view splits what you made from what you uploaded. In addition, eligible Pro, Business and Enterprise accounts can build ChatGPT Slides decks in Space and export them to PowerPoint, PDF or Google Slides from the web (ChatGPT release notes, 2026).

Can other people edit a ChatGPT page?

Yes. You share a page or a whole space, choose view or edit, and editors work on it together in real time. Subpages inherit access from their parent. Each collaborator works with their own ChatGPT, and sharing doesn’t expose your private chats or your Memory. Anything written on the page, however, is visible to everyone who can open it. That includes personal context ChatGPT pulled from Memory while drafting, so OpenAI suggests reviewing a page before you share it. Training follows each person’s own settings, too. If a collaborator has training on, the page content their ChatGPT reads or writes may be used for training even when yours is off (OpenAI Help, 2026).

ChatGPT Space vs Projects: what’s the difference?

A project is where you talk to ChatGPT about one topic; a space is where the finished document lives. ChatGPT Projects keep related chats, files and instructions together, so ChatGPT reuses the same context in every chat (OpenAI Help, 2026). Project instructions override your global custom instructions inside that project. You can paste Google Drive or Slack links as project sources, and save a good response as a source for later chats. OpenAI is explicit that creating or using a space “does not replace your existing Projects.” The plans differ, too. Projects and project sharing work on Free, Go, Plus, Pro, Business, Enterprise and Edu, while editing in Space needs Pro, Business or Enterprise.

	ChatGPT Projects	ChatGPT Space (Pages)
Holds	Chats, files and instructions	Pages, subpages, folders and files
Main job	Ongoing chats with shared context	Documents you edit and share
Plans	Every plan, Free included	Pro, Business, Enterprise
Files	5 on Free, 25 on Go and Plus, 40 on Pro	No per-page cap stated
Sharing	Chat or edit access, 5 to 100 collaborators by plan	View or edit, in real time
Mobile	Web and mobile apps	Read and share only

Sources: OpenAI Help, Projects in ChatGPT and Getting started with Space, 2026.

How does Gemini Notebook compare to ChatGPT Space and Projects?

Gemini Notebook is built around sources, not chats or documents. You add PDFs, Google Docs, web pages, YouTube videos or audio files (Gemini Notebook Help, 2026), and Google says chat responses “only use data from your sources,” with direct quotes as citations (Gemini Notebook Help, 2026). Hover over a citation to read the full quote. Ask for something your sources can’t support, such as rewriting the end of a story, and it may tell you it can’t answer. The Studio then turns those sources into Audio Overviews, Video Overviews, mind maps, reports, data tables, flashcards, quizzes, slide decks and infographics (Gemini Notebook Help, 2026).

Capacity is generous. A free account gets 100 notebooks with 50 sources each, Plus 200 with 100, Pro 500 with 300, and Ultra up to 600 sources per notebook (Gemini Notebook Help, 2026). Each source can hold up to 500,000 words, or 200MB for a local upload (Gemini Notebook Help, 2026). There’s one real limit, though: each notebook is independent, so Gemini Notebook can’t look across several notebooks at once.

	Gemini Notebook	ChatGPT Projects	ChatGPT Space
Built around	Sources you add	Chats with shared files	Pages you write and share
Answers draw on	Only your sources	Your files, ChatGPT’s knowledge, the web	Your chat, files, connected apps, Memory if on
Citations	Direct quotes from your sources	Links when it searches the web	You check sources before sharing
Outputs	Studio: audio, video, mind maps, quizzes, decks	Chat replies, drafts, images	Pages with charts and trackers, Slides
Free plan	100 notebooks, 50 sources each	Projects with 5 files	No creating or editing
Sharing	Specific people or anyone with the link	Chat or edit access	View or edit access

The people who find this site through search mostly ask about Projects, not Space. This site’s Search Console data shows the “Gemini Notebook vs ChatGPT Projects” question in six wordings, with 114 impressions in four weeks, while Space shows up only in Google autocomplete (“chatgpt spaces vs projects”, “chatgpt space pages”). In other words, people want to know whether a notebook and a project are the same thing. They aren’t, and the table above is the short version of why.

For the broader question of which assistant to open for which job, see our Gemini Notebook vs ChatGPT comparison. Claude users weighing the same split can read Gemini Notebook vs Claude Projects.

Do ChatGPT Pages cite their sources?

Not the way a notebook does. OpenAI’s Space help covers editing, comments, charts and sharing, but it doesn’t describe citations that tie a page’s sentences to the files behind them. Instead, it tells you to “check names, dates, calculations, and source information before using or sharing the page” (OpenAI Help, 2026). That’s fair advice for a writing tool. ChatGPT drafts from your conversation, your files, connected apps and, when Memory is on, personal context. Gemini Notebook flips the default: answers come only from your sources, and each claim carries a quote you can check. So if a page is headed to a client, a professor or an editor, the facts in it should come from somewhere you can point to.

That default shows up in the error rates. In a 2025 study on a 300-document corpus, researchers found hallucinations in 13% of NotebookLM’s outputs, versus about 40% for ChatGPT and Gemini (Hagar, Agustianto & Diakopoulos, arXiv, 2025). Most errors weren’t invented facts. Instead, the models “added unsupported characterizations of sources.” The study tested 2025 versions of each app’s chat, not Pages, so read it as a pattern rather than a score for Space. Still, the lesson carries over: a draft written from memory needs its facts checked, and one written from cited answers comes with the check attached.

We analyzed the 776 answers to the Kortex MCP waitlist survey (September and October 2026). In it, 110 people asked to query their notebooks from an AI chat and get cited answers back, and 69 named ChatGPT as an assistant they use. Separately, 244 of the 776 (31%) described a manual copy-paste workaround they rely on (Kortex MCP waitlist survey, 2026). In short, the problem isn’t picking one app. It’s the trip between them.

Can ChatGPT ask your Gemini notebooks while you write?

Yes, through Kortex MCP. Google publishes no public consumer API for Gemini Notebook, so ChatGPT can’t open your notebooks on its own. Kortex MCP is the bridge we built for that. ChatGPT connects to https://mcp.kortex-notebooklm.com/mcp, the call relays to the Kortex extension in your own Chrome, and the extension asks Gemini Notebook with the Google session you’re already signed in to (Kortex MCP docs, 2026). Once it’s connected, ChatGPT can:

• ask one notebook with ask_question and get the answer back with its citations.
• ask up to three notebooks at once with ask_library, which gets around the one-notebook-at-a-time limit.
• save pasted text into a notebook as a source with add_text_source, or keep the latest answer, citations included, as a notebook note with save_chat_to_note.

Here’s the loop that joins the two apps. In a ChatGPT chat, ask the notebook first, then turn the result into a page, which Space supports straight from a conversation:

Ask my "Customer interviews" notebook which pricing complaints came up most,
with citations. Then create a page from this conversation called "Pricing
findings", with each finding followed by the quote that supports it.

The facts come from Gemini Notebook, and the page is where your team edits them. Setup takes a URL and a sign-in. In ChatGPT on the web, open Plugins and add Kortex as a custom MCP server with the server URL and OAuth. OpenAI’s help says Business, Enterprise and Edu workspaces get full read and write, while personal Pro accounts can connect custom servers with read and fetch permissions only, so on a personal plan ChatGPT can ask your notebooks but may not save into them. Our client setup guide has the exact clicks. Which accounts can add a custom server depends on your ChatGPT plan and workspace settings, and ChatGPT asks before it runs a write action by default (OpenAI, 2026). Chrome has to stay open with Kortex signed in, and the first call after a quiet spell can take up to 30 seconds. Kortex never stores your Google password or cookies. Our guide to connecting Gemini Notebook to ChatGPT and Claude walks through more prompts.

What about meeting notes from the ChatGPT Meetings plugin?

The Meetings plugin takes notes from a call or an in-person conversation, with no bot joining, and saves a summary with suggested action items on a page in ChatGPT Space (OpenAI Help, 2026). It’s in beta in the ChatGPT desktop app on macOS for Pro and Business plans; Enterprise access is limited to an alpha group. It listens through your Mac’s microphone and system audio, and it stops on its own when you close the lid or a session reaches four hours. Two details matter for research. First, the audio is deleted once your notes are ready and can’t be replayed. Second, sharing a meeting page shares the notes, not the transcript. Also, get everyone’s consent first: the reminder in the app is visible only to you.

A meeting page is good at next steps. Research meetings, however, pile up. Customer interviews or expert calls are more useful side by side in a notebook, where you can ask across all of them with citations or turn them into an Audio Overview for the commute. Since ChatGPT can answer questions about your meetings, it can also hand the notes it reaches to Kortex MCP, which saves them into the right notebook as a text source.

Where should your research live?

Split it by job, not by app. Sources and facts go in Gemini Notebook, where every answer points back to a quote. Running chats with fixed instructions go in a ChatGPT project. Documents you write and share with a team go in Space. Here’s a quick guide.

If you mainly…	Put it in
Collect papers, reports or transcripts and need cited answers	Gemini Notebook
Study readings with flashcards, quizzes or audio	Gemini Notebook
Keep chatting about one topic with the same files and instructions	ChatGPT Projects
Write a brief, plan or report with teammates	ChatGPT Space (Pages)
Turn meetings into action items	Meetings plugin, then a page
Need traceable facts inside a polished document	A notebook for facts, a page for the write-up

Moving a ChatGPT chat into a notebook takes one click. Kortex’s import button inside ChatGPT sends the current chat to any notebook as a source, with prompts and replies labelled. Send the same chat again later, and Kortex updates that source instead of adding a copy. That’s handy when a ChatGPT brainstorm or deep research chat turns into material you want to ground answers in. The free plan covers 10 imports a day.

So you don’t have to choose. Keep the evidence in a notebook, write in Pages, and let Kortex carry answers between the two.

Frequently asked questions

What is ChatGPT Space?

Space is OpenAI’s home for pages, uploaded files and other work in ChatGPT. A page is an editable document you write with ChatGPT and share with view or edit access. Space replaces Library, while Projects stay separate. Creating and editing takes ChatGPT Pro, Business or Enterprise, on the web or in the desktop app.

Is ChatGPT Space the same as ChatGPT Projects?

No. A project keeps related chats, files and instructions together so ChatGPT reuses the same context, and it works on every plan, Free included. A space holds pages and files you edit and share. OpenAI says using a space does not replace your existing Projects, so many people use both.

Is Gemini Notebook the same as a ChatGPT project?

They look alike but answer differently. Both hold your files. Gemini Notebook answers only from your sources and cites each claim with a direct quote, then turns the sources into Studio outputs like Audio Overviews and quizzes. A ChatGPT project blends your files with ChatGPT’s own knowledge and the web.

Can ChatGPT Space replace Gemini Notebook?

For team documents, often yes. For cited research, no. OpenAI’s Space help describes editing, comments and sharing, and asks you to check source information before sharing a page. Gemini Notebook ties each answer to quotes from your sources, so it stays the better home for the facts behind a page.

Can I use my Gemini notebooks inside ChatGPT?

Yes. Kortex MCP lets ChatGPT ask your notebooks, up to three at once, and get answers back with citations, then save text or answers into a notebook. It’s included with Kortex Pro and Lifetime. The free Kortex extension also sends any ChatGPT chat to a notebook in one click.

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Editorial note: fact-checked against the official help pages and docs linked above on October 26, 2026. Spotted something out of date? Contact us and we will fix it, or read more about Kortex.